How to Repair a Pipe with Belzona Water-Activated Wrap

 In How To Series

Problem Areas

  • Leaking pipes
  • Cracked pipes
  • Corroded pipes
  • Pipe elbows – Irregular pipe fittings
  • T-pieces

Belzona Solution

Belzona 9631 is a leak-sealing water-activated wrap kit containing a 5cm x 150cm / 2in x 60in fiberglass pre-impregnated wrap. Packaged in a hermetically sealed foil pouch, it is ready to use and does not require any measuring or mixing.

It is odourless and very simple to apply. Belzona 9631 bonds well to copper, steel, SS, PVC and many other substrates. This water-activated wrap is a versatile solution for industries where quick-action pipe repairs are critical.

How to Repair a Pipe with Belzona Water-Activated Wrap

Belzona 9631 Kit Contents

  • Gloves
  • Surface roughing mesh
  • Cleaning wipes
  • Water-activated wrap in a sachet
  • Release film

Simple 4-Step Application


1. Abrade and degrease

prepare surface

2. Soak wrap

soak wrap

3. Apply wrap

wrap pipe

4. Consolidate wrap

compression film

Key Technical Data

Working Life

1.5min at 40°C/104°F

3min at 20°C/68°F

6min at 10°C/50°F

12min at 5°C/41°F

Belzona 9631 will harden in 60-90 minutes at 68°F/20°C but curing will take longer in dry climates or cold temperatures.

Tensile Shear Adhesion

(ASTM D1002)

Wet/dry mild steel: 990/750psi (6.8/5.2MPa)

Wet/dry copper: 850/330psi (5.9/2.3MPa)

Wet/dry SS: 1040/980psi (7.2/6.8MPa)

Wet/dry GRP: 490/360psi (3.4/2.5MPa)

Flexural Properties

When determined in accordance with ASTM D790, following cure at 68°F/20°C, typical values for Belzona 9631 tested as a nine-layer composite will be:

Flexural Strength: 23.8 x 103 psi / 165 MPa

Flexural Modulus: 22.3 x 105 psi / 15380 MPa

Belzona 9631 Application Video

Water-Activated Wrap: Key Benefits


Belzona 9631 is ready to use
no mixing 2


Bonds to many substrates
excellent adhesion


Quick return to service
quick turnaround


Resists pressures ~7Bar
pressure resistant

Solutions for live leaks

Belzona 9631 can be applied to a variety of pipes offline. To repair live leaks, other Belzona systems can be used, including Belzona 1212 applied in conjunction with a 3D-printed mesh.


Interested in how Belzona 9631 water-activated wrap kit can repair your pipes?

View case studies

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